Drilling machine



Nov. 6, 1928.

G. H. GILMAN DRILLING` MACHINE Filed Aug. 1o, 1921 s sheets-'sheet 1 mi@mW vm Nov. 6, 1928.

G. lH. GILMAN DRILLING MACHINE Filed Aug. 1o, 1921 s slwe'us-snenz,

e9e Zava/07?@v vena r Nov. 6, 1928.

G. H. GILMAN DRILLING MACHINE Filed. Aug. 1o, 1921 3 Sheets-Shegt 34wie? Patented Nov. 6, 1928.

4 UNITED STATES PATENT OFFICE.

GEORGE n. GILMAN, oF BELMONT, MASSACHUSETTS.

immune MACHINE.

Application ld August 10, 1921. Serial No. 491,136.

-of the accompanying drawings of a specificembodiment of my inventionselected for illustrative purposes, while the scope of my invention willbe particularly pointed out in the appended claims.

In the drawings Fig. 1 shows in elevation a breast stoper with apneumatic feed and constructed ac cording to my invention;

Fig. 2 is a longitudinal section of the feed cylinder and-associatedparts;

- Fig. 3 is al perspective showing .a detail of the machine;

Figs. 4 and 5 respectively are sections on the lines 4 4 and 5-5 of Fig.1; Fig. 6 is a sectionon the line f of Fig. 5; and f Fig. 7 representsthe valve in itsJ various positions, the sections corresponding to thoseon lines a-a, b-b and c-c of Fig. 5.

Referring to the drawings, I have shown an actuator'l for a tool 3. Theactuator and tool may be of any'A suitable type and as shown I haveindicated the actuator as a fluidv pressure operated impact engine andthe tool as a rock drill bit.

The drill actuator is provided with a mounting which may be of anysuitable type.Y

and as shown comprises a cylinder and piston, the latter being attachedto the actuator y for moving it along guide-Ways supported by thecylinder. v

As shown, the cylinder comprises the tubular structure 5 with front andrear heads 7 and 9. the latter being'provided with reduced diameterportions 11 which enter thel ends of the tubular structure and provideshoulders 13 abutting the ends thereof. At each end the tubularstructure is provided v'vith oppositely extending perforated ears 15 andeach cylinder head with similarly constructed and arranged ears 17.Through the perforations of the adjacent ears I pass the bolts 19 forholding the cylinder heads and tubular structure in assembled relation.

For supporting the actuator, I provide the guide-ways 21 each providinga longitudinally extending slot 23 receiving the guide members 25 of theactuator. Although the guide members 25 may be formed integrally withthe casing of the actuator I have shown them as comprising part of thecradle 27, the cradle having at opposite ends pairs of upstandingperforated ears 29 through the perforations of which I pass two of thefour side bolts 31 of the actuator for securing the parts together.

Sliding in the cylinder I mount the feed piston which comprises thepiston `head 33 and the piston rod 35. the latter being in the form of atube which extends through the rear cylinder head and is provided withthe return bend 36 and a portion 37 connected to the actuator.

For connecting the portion 37 of the rod 35 to the actuator I providethe member 394 havinga reduced diameter portion 41 received by the endof the portion 37 and welded thereto. At its opposite end the i member39 is formed to provide a plug 43 having the tapered frusto-conicalsurface 45 and the screw-threaded extremity 47. The actuator I providewith the upstandinglug 49 'in which is formed a tapered socket forreceiving the plug. The nut 51 carried on the screw-threaded portion 47of the member 39 serves to draw the plug 'into the socket and rigidlyhold it there. At its opposite end the tube 35 is Welded -to a member53, the exterior diameter of the intermediate portion ofthe latter beingintermediate the vexterior and interior diameters of the tube 35 so thatwhen-the reduced diameter portion 55 of the member 53 is inserted intothe end of the tube a shoulder 57 results,

against which the piston head is held by the nut 59 engaging theexterior screw-threads formed on the opposite end of the member 53.

For controlling movement of the feed pigston I locate in the member 39 acontrolling valve 61, by which I am able'to'supply motive iuid to theends of the feed cylinder. For conducting the motive fluid used at therearward end of the feed cylinder I utilize the passage afforded by thein terior-y of `the tube 35, kwhich interior is placed in communicationWith the rear end of the cylinder bymeans of the passages 63 and 64formed f the tube 65 is connected to the member 39 and at its lower endts in a iuid tight manner the reduced interior diameter portion 67 ofthe member4 53. The front end of the member 53 is provided with ascrewthreaded socket 69 in which is placed the nut 71 adapted to beforcedl against the tube. Rearwardly of the nut 71 is a locknut 73carried bythe socket and adapted to be forced against the nut 71. Thetube is somewhat flexible and is bent with the tube 35. At itsintermediate portion the tube 65 rests against the wall* ofthereturnbend 36 of the rod being forced intothis position by the nut71. By this construction the tube .is supported against vibration.Motive fluid admitted to the tube 65 discharges into the forward end ofthe feed cylinder through the perforations 75 and 77 of the nuts, therear end of the passa-ge afforded by the tube and perforations beingrestricted when the piston approaches the' forward end of its stroke bythe cushion plug 79 carried by the front cylinder head, which plug isarranged to enter said assage and is of. diameter slightly less than epassage.

The valve 67 for controlling the feed cylinder is of the frusto-conicalturning plug type and is located in a similarly shaped valve seat in themember 39. Opening through one side of the valve seat is a passage 81arranged longitudinally of the member 39 and placed in communication bymeans of a radial passage 83 with ay passage 85 formed in thecasing ofthe actuator and 'leading to the end of the valve casing 87 for thecontrolling valve of the actuator.

`The end of the passage 85 terminates in the valve casing 87 in suchmanner that it is in permanent communication with the air hoseconnection 89 supplying the actuator with motive fluid. Opening into theside of the valve seat opposite the passage 81 is a passage 91 formed inthe member 39 and in communication with the tube 35 and` spacedtherefrom is a passage 93 opening through the valve seat and incommunicamunication with the passage 81.

tion with the interior of the tube 65. The valve is provided -with anaxial passage 95 which in the plane of the passages 81 and 91 is placedin communication with the exterior of the valve by means of angularlyspaced radial passages 97 and 99, while in the plane vof the passage 93it is placed in communication with the exterior of the `valve by meansof the radialv passage 101. Intersecting the passages 99 and 101 are 101and o ening through the end of the valve to t e atmosphere. At the endof .the valve opposite the groove 109 I provide `communication therewiththe longitudinal groove 115 whichextends toward 'the center of the valveand terminates in the plane of the passage 81. For operating the valve Iprovidea valve handle 117 and for holding the valve to its seat thecompression spring 119 which abuts at one end the valve casing bonnet121 andfat its .other end the valve.

The operation of the valve is best illustrated by Fig. 7 which showsfive positions of the valve represented by sections c.a, (1 -b, and a-cof Fig. 5. The operation is as follows: In the neutral position it willbe noted that neither the supply passage 81 ,is connected to either thepassage 91 or 93 nor are the latter connectedto the atmosphere. If it isdesired to move the drill bit toward the work the valve is turnedclockwise to the position of the valve indicated as Slow forward. Inthis position the passage 81 operator 'places the valve. Under theseconditions, the feed piston is fed slowly forward due to the restrictedadmission of fluid to the rear end of the cylinder afforded by the slot103 and the more or less restricted exhaust through the groove 109. Whenit is desired to feed the bit forward with the 'maximum force, the valveis moved from the Slow forward position to` the Full forward position asillustrated by Fig. 7. Under these conditions the Vpassage 99 1s in fullcommunication with the passage 91 and the groove 109 in communicationwith the passage 93 which permits a full supply of motive fluid totherear end of the cylinder and a free exhaust from the front end of thecylinder.

When the work the valve is moved counterclock; wise fr om the neutralposition. Two of the retracting positions are illustrated in Fig. 7 bythe positions indicated Slow reverse and Full reverse. In the Slowreverse lem the drill bit is to be retracted from f position both thepassages 91 and 93 and A therefore the rear and front ends of the f eedcylinder are 1n communication with the passage 81, which causes the feedpiston to be movedrearwardly owing to the fact that the forwardeffective area of the piston is greater than the rearward effective areaof the piston. In the Slow reverse position the passage 81 supplies theaxial passage of the valve with motive fluid by way of the radialpassage 99 and from the axial passage the motive fluid is supplied tothe passage 91 by way of the radial passage 97 and to the passage 93 byway of the radial passage 101 and the restricted passage afforded by theslot 105. It will bey noted that in the Slow reverse position the frontend of the cylinder is in restricted communication with the source ofmotive fluid supply and that this in addition to the differential actioncauses a slow movement of the feed piston. If the bit is to be retractedwith the maximum of force the valve is moved to the osition indicated inFig. 7 as Full reverse". In moving to this position from the Slowreverse position the slot 105 has been moved away from the passage 93and the passage 101 moved into ful] communication with the passage 103to supply a full amount of motive fluid to the forward end of the feedcylinder. Also in such position the groove 115 is moved intocommunication with the passage 91 and thus the rear end of the feedcylinder is connected to the atmosphere by way of said groove, thegroove 113 and the passage 111. It will be understood that in each ofthe positions illustrated by Fig. 7, the supply of motive fluid and theexhaust thereof may be more or less varied by slightly moving the valveaway from said positions.

For purposes of support, the machine is attached in swivelled relationto a suitable standard as for example a tripodor minecolumn. For thispurpose I provf de a member having the frusto-conical trunnion 117 and abody 119 transversely perforated at 121 and provided at each side with aprojec.

tion having oppositely inclined surfaces 123 and 125 The feed cylinder Iprovide with longitudinally extending y guideways 127 having each asurface fitting the surface 123 and parallel thereto an opposite`surface 129. Extending through the perforations 121 I provide a studbolt 131 having screw-threaded end portions carrying the `nuts 133. Onthe ends of the stud bolt in position to be engaged by the nuts Iprovide clips 135 each provided with oppositely inclined surfaces, oneof which engages the surface 129 of one of the guide ways 123 and theother one of the surfaces 125. By means of this construction thetrunnion may be positioned at any desired point longitudinally of thefeed cylinder and may be clamped in such position by means of the nutsv133 and the bolt 131 which, when tightened, act to draw the clipstoward each other to clamp the contacting surfaces of the latter and ofthe clips and guide-ways firmly together. I have shown the two guideways21 and the twoguide-ways 12T formed separately from the feed cylinderand secured thereto as for example by welding. More than one of the fourguide ways may be formed of the same piece of metal as, for example,pairsv of guide-ways may be formed of the same piece, and. as shown. Ihave provided metal strips 13T each of which forms one of the guide ways21 and one of the gu'de ways 12T and is provided with a connectingportion 139 shaped to conform to the outer surface of the cylinder.These strips may be of any suitable material and formed in any suitabley way for example I have found iit practical to use for this vpurposesheet metal which may be formed or shaped in any suitable manner as forexample by pressing, drawino', rolling. extrusion or the lil'e.

The body of the feed cylinder I have indicated as formed of ai length141 of tubular stock, which stock may be formed in any usual or suitablemanner as for example may be drawn to form an integral tubular sheet ofmetal. For convenience of manufacture the end portions 143 of thecylinder are formed separately in order that the ears 15 and otherportions of the end may be easily machined. The end portions 143 of thefeed cylinder vand body portion 141 I have secured by buttwelding. Forexample` the four pieces indie-ated in Fig. 3 may be placed to getherwith the tube 141 projecting slightly beyond the ends of the strips 13Tand by means of an electric wel'd'the ends of the portions 141 and 143of the strips 139 may be all secured together. l

Although I have described for purposes of illustration one specificembodiment of my invention, it is to be understood that I am not limitedthereby to its particular details and that within the scope of myinvention wide deviations may be made from this embodiment withoutdeparting from the spirit of my invention.

Claims:

1. A hammer rock drill having, in combination. a supporting fixture, apercussive tool carrying a drill steel. feeding means for said steelcomprising a relativelythin walled tube constituting the barrel of a.feed cylinder, a piston in said cylinder operatively connected to saidpercussive tool for moving the latter relative to said cylinder.- meansslidably supporting said percnssive tool on seid cylinder and slidablysupporting said cylinder on said fixture comprising four spaced waysextending longitudinally of said cylinder parallel to the axial linethereof. said ways formed of relatively thin sheet metal parts havingportions conforming to the surface of said tube and welded thereto andportions extending away from the suri face of said tube for connectingthe percussive tool to said. cylinder and said cylinder to said fixture.l

2. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a relatively thin walled tube constituting the barrel of afeed cylinder, a piston in said cylinder operatively.

connected to said percussive tool for moving the latter relative to saidcylinder,- means slidably supporting said percussive tool on saidcylinder and slidably supporting said cylinder on said fixturecomprising four spaced Ways extending longitudinally of said cylinderparallel to the axial line thereof, said Ways in pairs formed integrallyof relatively thin sheet metal parts having portions respectivelydisposed at opposite portions of said tube conforming to the surfacethereof and welded thereto and having portions extending away from thesurface of saidtube for connecting the percussive tool to said cylinderand said cylinder to said fixture.

, 3. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a relatively thin walled tube constituting the barrel of afeed cylinder, a piston in said cylinder operatively connected to saidpercussive tool for moving v the latter relative to said cylinder, meansslidably supporting said percussive tool on said cylinder and slidablysupporting said cylinder on said fixture comprising four spaced waysextending longitudinally of said cylinder parallel to the axial linethereof, one pair of said Ways being at the top of said cylinder forconnecting said percussive tool thereto and the other pair being at thebottom of said cylinder for connecting said fixture thereto, the twoWays at each of opposite sides of said cylinder being formed integrallyof relatively thin sheet metal parts having portions conforming to thesurface of said tube and welded thereto. l

4. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a relatively thin walled tube constituting the barrel of afeed cylinder,a piston in said cylinder operatively connected to saidpercussive tool for moving the latter relative to said cylinder, meansslidably supporting said percussive ltool on said cylinder and slidablysupporting said cylinder on` said fixture comprising four spaced waysextending longitudinally of said cylinder parallel` to the axial linethereof, one pair of said ways being at the top of said cylinder forconnecting said percussive tool thereto and another pair being atthebottom of said cylinder for connecting said fixture thereto, saidways being formed Lacasse of relatively thin sheet metal parts havingtube constituting the barrel of a feed cylinder, a piston in saidcylinder operatively connected to said percussive tool for moving thelatter relative to said cylinder, means slidably supporting saidpereussive tool on said cylinder and slidably supporting said cylinderon said fixture comprising a pluralthin sheet metal parts havingportions conforming to the surface of said tube and welded thereto andportions extending away from said tube for connecting said percussivetool to said cylinder and saidv cylinder to said fixture, said waysbeing dlsposed parallel to the,axial line of said cylinder.

ity of ways formed integrally of relatively 6. A hammer rock drillhaving, in combination, a percussive tool carrying a drill steel,feeding means for said steel comprising a relatively thin walled tubeconstituting the barrel of a feedcylinder, a piston in said cylinderoperatively connected to said percussive tool for moving the latterrelative to said cylinder, means slidably supporting said percussivetool on said cylinder comprising4 a pair. of ways extendinglongitudinally of said Icylinder parallel to the axial line thereof,said ways formed integrally with each other of relatively thin sheetmetal parts havin portions conforming to the surface of said tube andwelded thereto and portions extending away from said tube for connectingsaid percussive tool to said'cylinder.

-7. Ayhammer rock drill having, in combination,' a percussive toolcarrying a drill steel, lfeeding means for said steel comprising arelatively thin walled tube constituting the barrel of a feed cylinder,a piston in said cylinder operatively connected to said percussive toolfor moving the latter relative to said cylinder, means slidablysupporting said percussive tool' oir said cylinder comprising a pair ofways extending longtusaid fixture, said feeding means comprising fourspaced Ways arranged parallel to the axial line of said percussive tool,a pair of said Ways being connected to said percussive tool and a pairto said fixture. and said Ways in pairs being formed integrally witheach other of relatively thin sheet metal parts, and means holding theways of the two integrally formed pairs of ways in assembled relationwith said tube as a unit. J

9. A hammer rock drill having, in combination,` a supporting fixture, apercussive tool carrying a drill steel, feeding means for said drillsteel slidably supporting said percussive tool and being slidablysupported by said fixture, said feeding means comprising a plurality ofspaced ways formed integrally as a Whole of relatively thin sheet metalhaving guide portions for connection to said percussive tool and fixturerespectively and portions connecting said guide portions, said ways andtube as a unit being secured in assembled relation.

10. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a tube constituting the barrel of a feed cylinder, a pistonin said cylinder operatively connected to said tool for moving itrelative to said cylinder, means slidably supporting said tool on saidcylinder and slidably supporting said cylinder on said fixturecomprising four spaced Ways extending longitudinally of said cylinderparallel' to the axial line thereof, said Ways ha'vin portionsconforming to the surface of sai tube Welded thereto and portionsextending away from the surface of said tube for connecting said tool tosaid cylinder and the latter to said fixture.

11. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprisin a tube constituting the barrel of a feed cy nder, a `piston insaid cylinder operativelyv connected to said tool for moving it relativeto said cylinder, means slidablyv supporting said tool on said cylinderand slidably supporting said cylinder on said fixture comprisin four saced ways extending longitudina y of said cylinder arallel to the axialline thereof, said ways 1n pairs formed integrally with each other andhaving portions respectively disposed at o posite portions of said tubeconforming to t e surface thereof and welded thereto,

said ways having other fportions extending awa from the surface o saidtube for connectmg said tool tol said cylinder and the latter to saidfixture.

12. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a tube constltut- .ing a plurality of Ways formed integrallywith each other and having portions conforming to the surface of saidtube and welded thereto.

13. A hammer rock drill having, in combination, a percussive toolcarrying a drill steel, a feed cylinder and feed piston, meansoperatively connecting said piston and tool for moving the latterrelative to said cylinder, said cylinder slidably carrying said toolindependently of said means and also carrying means for attachment to asupport, said cylinder comprising a tube constituting the barrel thereofand a pair of spaced Ways formed integrally with a part connecting saidways, said part extending lengthwise of said tube and conforminv to thesurface thereof substantially througliout the length of the tube andbeing Welded thereto,

14. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a tube constituting the barrel of a feed cylinder, a pistonin said cylinder operatively connected to said tool for moving itrelative to said cylinder, means slidably supporting said tool on saidcylinder and slidably supporting said cylinder on said xture comprisingfour spaced ways extending longitudinally of said cylinder parallel tothe axial line thereof, said ways and tube as a unit secured inassembled relatitgi with the Ways distributed around said tu e.

15. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carrying a drill steel, feeding means for said steelcomprising a tube constituting the barrel of a feed cylinder, a pistonin said cylinder operatively connected to said tool for moving itrelative to said cylinder, means slidably supporting said tool on saidcylinder and'slidably supporting said cylinder on said fixturecomprising four spaced ways extending longitudinally of said cylinderparallel to the axial line 'S`thereof, said ways in pairs formedintegrally with each other [and said ways and tube as a unit secured inassembled relation. Y

16. A hammer rock drill having, in combination, a supporting fixture, apercussive tool carr ing a drill steel, feeding means for said steecomprising atube constituting the barrel of a feed cylinder, a piston insaid cylinder operatively connected to said tool for moving it relativeto said cylinder, means slidably supporting said tool on said cylinderandslidably, supporting said cylinder on said fixture comprising aplurality los llll

vvice comprising a cylinder element and ston element one of which ismovable, a v rill actuator, means connecting said actuator with saidmovable element comprising a t part movable with said actuator andprocradle, va. piston in said feed cylinder, and

viding` a tapered socket, a tapered plug secured to the movable elementof said feeding device, said plug fitting said socket and securedthereto, a valve carried by said plug and controlling 'fluid for bothends of said cylinder, and a single assage opening through thecontacting sur aces of said p ug and socket ,for connecting sa'id valveto a source of luid supply.

` 18. A rock drill having in combination, a drill steel, a hammeringengine for actuating said steel, a tubular feed cylinder having arelatively thin cylindrical Wall, sheet metal members at opposite sidesof said cylinder having ortions conforming to the walls of said cylinderand welded thereto, said sheet metal members being bent at their upperedges to'form open sided channels extending longitudinally of saidcylinder, a cradle sliding in said channels, means for securing saidhammering engine to said means for causing said piston to move saidcradle along said channels comprising a substantially U-shaped rodhaving one leg se` `cylinder having portions conforming to the walls ofsaid cylinder and Welded thereto, said sheet metal members being bentat. their upper edges to forni open sided channels extendinglongitudinall of said cylinder, a cradle slidin in sai channels,l meansfor securing sai cradle, a piston in said feed cylinder, means forcausing said piston to move said cradle along said channels comprising asubstantially U-shaped rod having one leg secured to said piston andprojecting` from the rear end of saidl cylinder said sheet metalmeinlbers having portions at their lower edges bent to form ways, and afixture for securing said machine to a support slidably secured to saidways.

In. testimony whereof, I have signed my name to this specification.

hammering engine to said'

